# fp=
# fp=open('wyg.txt','a+')
# s='喜欢烧烤\n更喜欢大排档\n'
# fp.seek(7)
# fp.write("haha")
# fp.close()
# open('file.txt','w')
# # fp.write('hello world')
# fp.write('wo ai ni !')
# fp.seek(0,2)
# length=fp.tell()
# fp.close()
# print('文件长度=',length)






